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co•ma

Pronunciation: (kō'mu), [key]
—n.,
—pl. -mas.
a state of prolonged unconsciousness, including a lack of response to stimuli, from which it is impossible to rouse a person.

co•ma

Pronunciation: (kō'mu), [key]
—n.,
—pl. -maePronunciation: (-mē). [key]
1. Astron.the nebulous envelope around the nucleus of a comet.
2. Optics.a monochromatic aberration of a lens or other optical system in which the image from a point source cannot be brought into focus, the image of a point having the shape of a comet.
3. Bot.
a. a tuft of silky hairs at the end of a seed.
b. the leafy crown of a tree; cluster of leaves at the end of a stem.
c. a terminal cluster of bracts, as in the pineapple.

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